The strange behavior seems to be related to physical problems on my hard drive, I had to change it for a new one.
Insync is all the time deleting my local files!. I almost lost all my programming work. I manually copy a folder from an external source and Insync keeps deleting it. It seems to happen while uploading a huge file (a virtual machine file), but I am not sure of that.
This is not the first time it happens and I do not know what I am doing wrong. I am not sure I can rely on Insync right now. I am running Insync v1.3.14 in OpenSUSE Leap 42.2 x86_64.